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案例一:“简便计算”教学片断(人教版四年级下册)联系生活实际,理解简便计算的应用。师:(先出示一本书)老师这两天在看这本《数学的奥秘》。这本书一共有234页,我第一天看了66页,第二天看了34页,那么,大家帮我算一算:我还有多少页没有看?生1:老师,我有办法,把这本书的页数234减去第一天看的页数66,
Case 1: “Simple Calculation ” Teaching Pieces (PEP fourth grade volumes) contact with the actual life, to understand the simple calculation of the application. Teacher: (first show a book) teacher two days to see this “math mystery.” This book has a total of 234 pages, I read the first page of 66 pages the next day saw 34 pages, then, everyone help me calculate: how many pages I did not see Health 1: Teacher, I have a way , Subtracting the number of pages viewed from the first day of page 234 from the number of pages 234 of the book,